Recording and reproducing device with guide shaft attaching mechanism

ABSTRACT

To provide a guide shaft attaching structure for a disk device in which the number of components can be reduced, a guide shaft is attached easily, and only a small attaching space is required. The guide shaft attaching structure is characterized in that a fixed end  4  of a torsion spring  2  is locked to a rear side of a chassis  5,  coil portion  1  is held by a spring holding section  3,  a biasing end  8  of the torsion spring  2  is locked in a locking section  9,  a guide shaft  6  is inserted between left and right positioning projections  7  and set to be located above the biasing end  8,  and the guide shaft  6  is fastened by a screw  13.  A disk of the screw  13  is not biased by the biasing end  8  at a point when screwing of the screw  13  is started.

The present application is based on and claims priority of Japanesepatent application No. 2004-316475 filed on Oct. 29, 2004, the entirecontents of which are hereby incorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an attaching mechanism for attaching,in the inside of a disk device for writing or reading of information, aguide shaft for guiding a pickup unit in a radial direction of a disk toa traverse chassis so as to be adjustable in height.

2. Description of the Related Art

A disk device rotates a recording medium such as a disk with a turntable in the inside of an apparatus and slides a pickup unit in a radialdirection of the disk to read or write information. What carries out arole of guiding the pickup unit in this case is a guide shaft. The guideshaft is attached to a traverse chassis.

A guide shaft attaching structure for the disk device is roughly dividedinto a system for attaching a guide shaft according to displacement of achassis, a screw fastening system, a spring locking system, and a systemfor biasing a guide shaft with a spring and fastening the guide shaftwith a screw. For example, Japanese Patent Laid-Open Publication No.2002-50137 (Patent Document 6) discloses the chassis displacementsystem, Japanese Patent Laid-Open Publication Nos. 7-57404, 11-126440,11-288564, 2000-149466, and 2002-334528 (patent documents 1, 3, 4, 5 and8) disclose the screw fastening system, Japanese Patent Laid-OpenPublication Nos. 7-161152 and 2002-92898 (patent documents 2 and 7)disclose the spring locking system, and Japanese Patent Laid-OpenPublication Nos. 2002-367189 and 2002-367301 (patent documents 9 and 10)disclose the spring biasing and screw fastening system. Among thesesystems, height is adjustable only in the attaching structure of thespring biasing and screw fastening system.

It is possible to use a compression spring, a leaf spring, a torsionspring, and the like for the spring biasing and screw fastening system.The systems disclosed in patent documents 9 and 10 are systems of a typeusing the leaf spring. Among these springs, the torsion spring can biasan attached guide shaft with most stable force and also bias the guideshaft with most stable force in adjusting height thereof.

When the torsion spring is used for attachment of the guide shaft,first, the torsion spring is held on the traverse chassis. Then, a tipof the torsion spring is rotated in a compressing direction. The guideshaft is set in an attachment position in a state in which the torsionspring is kept compressed by some gig or component. The guide shaft isfastened by a spring. Finally, height of the guide shaft is adjusted tocomplete the attachment. The guide shaft is attached to the traversechassis to be adjustable in height through biasing by the torsion springand fastening by a screw.

The conventional guide shaft attaching structure, which uses a torsionspring and is capable of adjusting height of the guide shaft, hasseveral problems. One of the problems is that, since a component or agig for locking the tip of the torsion spring rotated in the compressingdirection is required and a space for the component or the gig has to besecured, a reduction in size of an entire traverse unit is hindered. Inaddition, the tip of the torsion spring has to be rotated in thecompressing direction, the guide shaft has to be set in the attachmentposition in a state in which the torsion spring is kept compressed bysome gig or component, and the guide shaft has to be fastened by thescrew while holding the torsion spring. Therefore, guide shaftattachment work is not easy. Moreover, when the guide shaft is subjectedto biasing force of the spring before screwing is started, it is noteasy to start screwing.

SUMMARY OF THE INVENTION

It is an object of the invention to solve the problems and provide aguide shaft attaching structure for a disk device in which means forholding a torsion spring at the time of attachment of a guide shaft canbe realized without increasing the number of components, attachment ofthe guide shaft can be performed easily, it is unnecessary to secure aspace for a component for holding the torsion spring in a traversechassis, it is possible to reduce a size of an entire traverse unit, andit is easy to start screwing.

A recording and reproducing device with a guide shaft attachingmechanism according to claim 1 is a recording and reproducing deviceincluding: a pickup unit that reads information written in a recordingmedium and/or writes information in the recording medium; a guide shaftthat supports the pickup unit so as to be movable; a support sectionthat supports an end of the guide shaft; and a chassis with which thesupport section is integrally formed. The recording and reproducingdevice is characterized in that vertically-projected positioningprojections, which support sides of the guide shaft, are formed in thesupport section, biasing means, which applies biasing force to the guideshaft, and fastening means, which fastens the guide shaft to the supportsection, are provided near the support section, a biasing means holdingsection for holding the biasing means is formed in the chassis, and alocking section, which controls the biasing force of the biasing meansto be fixed and makes it possible to lock the biasing means, is formedintegrally with the support section.

A recording and reproducing device with a guide shaft attachingmechanism according to claim 2 is characterized in that, in therecording and reproducing device with a guide shaft attaching mechanismaccording to claim 1, a torsion spring is used as the biasing means forapplying biasing force to the guide shaft, an end and a coil portion ofthe torsion spring are held by the biasing means holding section formedin the chassis, and fixed biasing force is applied to the other end ofthe torsion spring to lock the other end of the torsion spring to thelocking section.

A recording and reproducing device with a guide shaft attachingmechanism according to claim 3 is characterized in that, in therecording and reproducing device with a guide shaft attaching mechanismaccording to claim 1 or 2, biasing force generated by the biasing meansacts in a direction in which the guide shaft comes off the supportsection.

A recording and reproducing device with a guide shaft attachingmechanism according to claim 4 is characterized in that, in therecording and reproducing device with a guide shaft attaching mechanismaccording to claim 1, 2, or 3, a screw is used as the fastening meansfor fastening the guide shaft to the support section, a fastening holeformed to pierce through the chassis and the support section is formed,and the screw is screwed in a direction in which a fastening force actsagainst the biasing force.

A recording and reproducing device with a guide shaft attachingmechanism according to claim 5 is characterized in that, in therecording and reproducing device with a guide shaft attaching mechanismaccording to claim 1, 2, 3, or 4, a rise-up part, which is formed insubstantially an L-shape by continuously forming a support portionerected vertically and a holding portion projected horizontally, isformed in the chassis as the biasing means holding section for holdingthe biasing means.

A recording and reproducing device with a guide shaft attachingmechanism according to claim 6 is characterized in that, in therecording and reproducing device with a guide shaft attaching mechanismsaccording to claim 1, 2, 3, 4, or 5, the locking section for controllingbiasing force of the biasing means to be fixed and locking the biasingmeans is formed in a hook shape and formed integrally with the supportsection of the guide shaft and locks the biasing means in a positionlower than the positioning projections of the guide shaft.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view representing a state in which a coil portion of atorsion spring is held by a spring holding section, a fixed end of thetorsion spring is locked to a rear side of a chassis, and a biasing endof the torsion spring is locked in a locking section.

FIG. 2 is a front view representing a state in which a guide shaft isheld between left and right positioning projections of a support sectionand set at the biasing end of the torsion spring.

FIG. 3 is a front view representing a state in which screwing of a screwin a screw fastening hole of the chassis is started.

FIG. 4 is a front view representing a state in which the screw isfastened to adjust height of the guide shaft.

FIG. 5 is a bottom view representing a state in which the guide shaft isheld between the left and the right positioning projections of thesupport section and set at the biasing end of the torsion spring.

FIG. 6 is a side view representing a state in which the screw isfastened to adjust height of the guide shaft.

FIG. 7 is a diagram for explaining a disk device including a chassis, aguide shaft, a pickup unit, and a turn table.

FIG. 8 is a plan view representing a chassis assembled with a guideshaft and a pickup unit.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

An example of a best mode for carrying out a guide shaft attachingstructure of a disk device according to the invention will behereinafter explained with reference to the drawings. However, theinvention is not limited to this embodiment.

FIG. 1 is a front view representing a state in which a coil portion of atorsion spring according to the invention is held by a spring holdingsection, a fixed end of the torsion spring is locked to a rear side of achassis, and a biasing end of the torsion spring is locked in a lockingsection. FIG. 2 is a front view representing a state in which a guideshaft is held between left and right positioning projections of asupport section and set at the biasing end of the torsion spring. FIG. 3is a front view representing a state in which screwing of a screw in ascrew fastening hole of the chassis is started. FIG. 4 is a front viewrepresenting a state in which the screw is fastened to adjust height ofthe guide shaft. FIG. 5 is a bottom view representing a state in whichthe guide shaft is held between the left and the right positioningprojections of the support section and set at the biasing end of thetorsion spring. FIG. 6 is a side view representing a state in which thescrew is fastened to adjust height of the guide shaft. FIG. 7 is adiagram for explaining a disk device including a chassis, a guide shaft,a pickup unit, and a turn table. FIG. 8 is a plan view representing achassis assembled with a guide shaft and a pickup unit.

As shown in the figures, a spring holding unit 3 is formed in a chassis5. A support section 10 is formed integrally with the chassis 5 besidethe spring holding section 3 by outsert molding. A screw fastening hole12 is formed behind the support section 10. The spring holding section 3consists of a rise-up part 16 that is formed in substantially an L-shapeby continuously forming a support portion 16 a erected vertically from ahole section 15 formed in the chassis 5 and a holding portion 16 bprojected horizontally from a tip of the support portion 16 a. A slit 17for positioning a fixed end 4 of a torsion spring 2 serving as biasingmeans is formed in the hole section 15. A pair of left and rightpositioning projections 7 is formed in the support section 10. A lockingsection 9 is formed on a front surface or a rear surface of at least oneof the left and the right positioning projections 7. Both the supportsection 10 and the spring holding section 3 are arranged forward of thescrew fastening hole 12. As a front to rear arrangement relation, whenthe locking section 9 is formed on the front surface of the positioningprojection 7, the screw fastening hole 12, the spring holding section 3shifted laterally from the screw fastening hole 12, and the positioningprojections 7 located ahead of the screw fastening hole 12 are arrangedin this order from the front. When the locking section 9 is formed onthe rear surface of the positioning projection 7, the screw fasteninghole 12, the positioning projections 7 located ahead of the screwfastening hole 12, and the spring holding section 3 shifted laterallyfrom the positioning projections 7 are arranged in this order from thefront (only the case in which the locking section 9 is formed on thefront surface of the positioning projection 7 is shown in the figuresand the case in which the locking section 9 is formed on the rearsurface of the positioning projection 7 is not shown). Opposed innersurfaces of the positioning projections 7 are formed vertically. Aninterval between the inner surfaces of the left and the rightpositioning projections 7 is formed to be the same as a diameter of theguide shaft 6. The locking section 9 is formed in a hook shape in orderto lock a biasing end 8 of the torsion spring 2.

For attachment of the guide shaft 6, the spring holding section 3, thechassis 5 having the support section 10 formed by outsert molding, thetorsion spring 2 serving as biasing means, and a screw with disk 13serving as fastening means are used. As attachment work for the guideshaft 6, first, a coil portion 1 of the torsion spring 2 is insertedinto a holding portion 16 b of the spring holding section 3, the fixedend 4 of the torsion spring 2 is inserted through the hole section 15formed by drilling of the spring holding section 3 and hooked to theslit 17 formed in the hole section 15 to be locked to the rear side ofthe chassis 5. The biasing end 8 of the torsion spring 2 is rotated inthe compressing direction to be locked to the locking section 9 of thesupport section 10. The guide shaft 6 is inserted between the left andthe right positioning projections 7 of the support section 10 and set tobe located above the biasing end 8 of the torsion spring 2.Consequently, the positioning in the horizontal direction of the guideshaft 6 is completed. Subsequently, the screw 13 is screwed in the screwfastening hole 12. The biasing end 8 of the torsion spring 2 is lockedin the locking section 9 and never comes into contact with the disk ofthe screw 13. Thus, the disk of the screw 13 is not subjected to biasingforce by the guide shaft 6 at a point when screwing is started. It ispossible to start the screwing easily. It is possible to stop movementin an axial direction of the guide shaft 6 by screwing and fastening thescrew 13 in the screw fastening hole 12. In addition, it is possible toadjust height of the guide shaft 6 biased by the torsion spring 2 bypressing the tip of the guide shaft 6 with the part of the disk.

According to the recording and reproducing device with a guide shaftattaching mechanism in claim 1, the recording and reproducing deviceincludes: a pickup unit that reads information written in a recordingmedium and/or writes information in the recording medium; a guide shaftthat supports the pickup unit so as to be movable; a support sectionthat supports an end of the guide shaft; and a chassis with which thesupport section is integrally formed. Vertically-projected positioningprojections, which support sides of the guide shaft, are formed in thesupport section, biasing means for applying biasing force to the guideshaft and fastening means for fastening the guide shaft to the supportsection are provided near the support section, a biasing means holdingsection for holding the biasing means is formed in the chassis, and alocking section, which controls the biasing force of the biasing meansto be fixed and makes it possible to lock the biasing means, is formedintegrally with the support section. Thus, the locking section is formedintegrally with the support section of the chassis. This makes acomponent or a gig for holding a biasing end of the biasing meansunnecessary and makes it possible to reduce the number of components,attaching tools, and the like. The locking section for locking thebiasing end of the biasing means is provided in the support section ofthe guide shaft. The left and right positioning projections of thesupport section serve as left and right holding sections in attachingthe guide shaft. This makes it possible to perform attachment work forthe guide shaft at the time of assembly of the traverse unit in a shorttime and easily and realize improvement of workability. In addition, acomponent or a gig for holding the biasing end of the torsion spring ismade unnecessary. Thus, there is room in spaces in the traverse unit inwhich a large number of components are arranged densely. This makes itpossible to reduce a size of the entire traverse unit and leads to areduction in a size of the entire device.

According the recording and reproducing device with a guide shaftattaching mechanism in claim 2, in the recording and reproducing devicewith a guide shaft attaching mechanism according to claim 1, a torsionspring is used as the biasing means for applying biasing force to theguide shaft, an end and a coil portion of the torsion spring are held bythe biasing means holding section formed in the chassis, and fixedbiasing force is applied to the other end of the torsion spring to lockthe other end of the torsion spring to the locking section. This makesit possible to assemble the torsion spring, which applies biasing forceto the guide shaft, to the chassis simply and easily and improveworkability for assembly of the torsion spring.

According to the recording and reproducing device with a guide shaftattaching mechanism in claim 3, in the recording and reproducing devicewith a guide shaft attaching mechanism according to claim 1 or 2,biasing force generated by the biasing means acts in a direction inwhich the guide shaft comes off the support section. Therefore, theguide shaft assembled to the support section is biased by the biasingmeans and supported stably without back-lash.

According to the recording and reproducing device with a guide shaftattaching mechanism in claim 4, in the recording and reproducing devicewith a guide shaft attaching mechanism according to claim 1, 2, or 3, ascrew is used as the fastening means for fastening the guide shaft tothe support section, a fastening hole formed to pierce through thechassis and the support section is formed, and the screw is screwed in adirection in which a fastening force acts against the biasing force.This makes it possible to easily fix the guide shaft simply by screwingthe screw in the fastening hole.

According to the recording and reproducing device with a guide shaftattaching mechanism in claim 5, in the recording and reproducing devicewith a guide shaft attaching mechanism according to claim 1, 2, 3, or 4,a rise-up part, which is formed in substantially an L-shape bycontinuously forming a support portion erected vertically and a holdingportion projected horizontally, is formed in the chassis as the biasingmeans holding section for holding the biasing means. This makes itpossible to hold the biasing means to the chassis with a simpleconstitution.

According to the recording and reproducing device with a guide shaftattaching mechanism in claim 6, in the recording and reproducing devicewith a guide shaft attaching mechanisms according to claim 1, 2, 3, 4,or 5, the locking section for controlling biasing force of the biasingmeans to be fixed and locking the biasing means is formed in a hookshape and formed integrally with the support section of the guide shaftand locks the biasing means in a position lower than the positioningprojections of the guide shaft. Thus, biasing force of the biasing meansis not applied to the screw at a point when screwing is started. Thismakes it possible to start screwing easily in a state in which the guideshaft is held stably. Consequently, efficiency of work is improvedremarkably in attaching the guide shaft.

1. A recording and reproducing device with a guide shaft attachingmechanism comprising: a pickup unit that reads information written in arecording medium and/or writes information in the recording medium; aguide shaft that supports the pickup unit so as to be movable; a supportsection that supports an end of the guide shaft; and a chassis withwhich the support section is integrally formed, characterized in thatvertically-projected positioning projections, which support sides of theguide shaft, are formed in the support section, biasing means, whichapplies biasing force to the guide shaft, and fastening means, whichfastens the guide shaft to the support section, are provided near thesupport section, a biasing means holding section for holding the biasingmeans is formed in the chassis, and a locking section, which controlsthe biasing force of the biasing means to be fixed and makes it possibleto lock the biasing means, is formed integrally with the supportsection.
 2. The recording and reproducing device with a guide shaftattaching mechanism according to claim 1, characterized in that atorsion spring is used as the biasing means for applying biasing forceto the guide shaft, an end and a coil portion of the torsion spring areheld by the biasing means holding section formed in the chassis, andfixed biasing force is applied to the other end of the torsion spring tolock the other end of the torsion spring to the locking section.
 3. Therecording and reproducing device with a guide shaft attaching mechanismaccording to claim 1, characterized in that biasing force generated bythe biasing means acts in a direction in which the guide shaft comes offthe support section.
 4. The recording and reproducing device with aguide shaft attaching mechanism according to claim 1, characterized inthat a screw is used as the fastening means for fastening the guideshaft to the support section, a fastening hole formed to pierce throughthe chassis and the support section is formed, and the screw is screwedin a direction in which a fastening force acts against the biasingforce.
 5. The recording and reproducing device with a guide shaftattaching mechanism according to claim 1, characterized in that arise-up part, which is formed in substantially an L-shape bycontinuously forming a support portion erected vertically and a holdingportion projected horizontally, is formed in the chassis as the biasingmeans holding section for holding the biasing means.
 6. The recordingand reproducing device with a guide shaft attaching mechanisms accordingto claim 1, characterized in that the locking section for controllingbiasing force of the biasing means to be fixed and locking the biasingmeans is formed in a hook shape and formed integrally with the supportsection of the guide shaft and locks the biasing means in a positionlower than the positioning projections of the guide shaft.
 7. Therecording and reproducing device with a guide shaft attaching mechanismaccording to claim 2, characterized in that biasing force generated bythe biasing means acts in a direction in which the guide shaft comes offthe support section.
 8. The recording and reproducing device with aguide shaft attaching mechanism according to claim 2, characterized inthat a screw is used as the fastening means for fastening the guideshaft to the support section, a fastening hole formed to pierce throughthe chassis and the support section is formed, and the screw is screwedin a direction in which a fastening force acts against the biasingforce.
 9. The recording and reproducing device with a guide shaftattaching mechanism according to claim 3, characterized in that a screwis used as the fastening means for fastening the guide shaft to thesupport section, a fastening hole formed to pierce through the chassisand the support section is formed, and the screw is screwed in adirection in which a fastening force acts against the biasing force. 10.The recording and reproducing device with a guide shaft attachingmechanism according to claim 7, characterized in that a screw is used asthe fastening means for fastening the guide shaft to the supportsection, a fastening hole formed to pierce through the chassis and thesupport section is formed, and the screw is screwed in a direction inwhich a fastening force acts against the biasing force.
 11. Therecording and reproducing device with a guide shaft attaching mechanismaccording to claim 2, characterized in that a rise-up part, which isformed in substantially an L-shape by continuously forming a supportportion erected vertically and a holding portion projected horizontally,is formed in the chassis as the biasing means holding section forholding the biasing means.
 12. The recording and reproducing device witha guide shaft attaching mechanism according to claim 3, characterized inthat a rise-up part, which is formed in substantially an L-shape bycontinuously forming a support portion erected vertically and a holdingportion projected horizontally, is formed in the chassis as the biasingmeans holding section for holding the biasing means.
 13. The recordingand reproducing device with a guide shaft attaching mechanism accordingto claim 4, characterized in that a rise-up part, which is formed insubstantially an L-shape by continuously forming a support portionerected vertically and a holding portion projected horizontally, isformed in the chassis as the biasing means holding section for holdingthe biasing means.
 14. The recording and reproducing device with a guideshaft attaching mechanism according to claim 7, characterized in that arise-up part, which is formed in substantially an L-shape bycontinuously forming a support portion erected vertically and a holdingportion projected horizontally, is formed in the chassis as the biasingmeans holding section for holding the biasing means.
 15. The recordingand reproducing device with a guide shaft attaching mechanism accordingto claim 8, characterized in that a rise-up part, which is formed insubstantially an L-shape by continuously forming a support portionerected vertically and a holding portion projected horizontally, isformed in the chassis as the biasing means holding section for holdingthe biasing means.
 16. The recording and reproducing device with a guideshaft attaching mechanism according to claim 9, characterized in that arise-up part, which is formed in substantially an L-shape bycontinuously forming a support portion erected vertically and a holdingportion projected horizontally, is formed in the chassis as the biasingmeans holding section for holding the biasing means.
 17. The recordingand reproducing device with a guide shaft attaching mechanism accordingto claim 10, characterized in that a rise-up part, which is formed insubstantially an L-shape by continuously forming a support portionerected vertically and a holding portion projected horizontally, isformed in the chassis as the biasing means holding section for holdingthe biasing means.
 18. The recording and reproducing device with a guideshaft attaching mechanisms according to claim 2, characterized in thatthe locking section for controlling biasing force of the biasing meansto be fixed and locking the biasing means is formed in a hook shape andformed integrally with the support section of the guide shaft and locksthe biasing means in a position lower than the positioning projectionsof the guide shaft.
 19. The recording and reproducing device with aguide shaft attaching mechanisms according to claim 3, characterized inthat the locking section for controlling biasing force of the biasingmeans to be fixed and locking the biasing means is formed in a hookshape and formed integrally with the support section of the guide shaftand locks the biasing means in a position lower than the positioningprojections of the guide shaft.
 20. The recording and reproducing devicewith a guide shaft attaching mechanisms according to claim 4,characterized in that the locking section for controlling biasing forceof the biasing means to be fixed and locking the biasing means is formedin a hook shape and formed integrally with the support section of theguide shaft and locks the biasing means in a position lower than thepositioning projections of the guide shaft.
 21. The recording andreproducing device with a guide shaft attaching mechanisms according toclaim 5, characterized in that the locking section for controllingbiasing force of the biasing means to be fixed and locking the biasingmeans is formed in a hook shape and formed integrally with the supportsection of the guide shaft and locks the biasing means in a positionlower than the positioning projections of the guide shaft.
 22. Therecording and reproducing device with a guide shaft attaching mechanismsaccording to claim 7, characterized in that the locking section forcontrolling biasing force of the biasing means to be fixed and lockingthe biasing means is formed in a hook shape and formed integrally withthe support section of the guide shaft and locks the biasing means in aposition lower than the positioning projections of the guide shaft. 23.The recording and reproducing device with a guide shaft attachingmechanisms according to claim 8, characterized in that the lockingsection for controlling biasing force of the biasing means to be fixedand locking the biasing means is formed in a hook shape and formedintegrally with the support section of the guide shaft and locks thebiasing means in a position lower than the positioning projections ofthe guide shaft.
 24. The recording and reproducing device with a guideshaft attaching mechanisms according to claim 9, characterized in thatthe locking section for controlling biasing force of the biasing meansto be fixed and locking the biasing means is formed in a hook shape andformed integrally with the support section of the guide shaft and locksthe biasing means in a position lower than the positioning projectionsof the guide shaft.
 25. The recording and reproducing device with aguide shaft attaching mechanisms according to claim 10, characterized inthat the locking section for controlling biasing force of the biasingmeans to be fixed and locking the biasing means is formed in a hookshape and formed integrally with the support section of the guide shaftand locks the biasing means in a position lower than the positioningprojections of the guide shaft.
 26. The recording and reproducing devicewith a guide shaft attaching mechanisms according to claim 11,characterized in that the locking section for controlling biasing forceof the biasing means to be fixed and locking the biasing means is formedin a hook shape and formed integrally with the support section of theguide shaft and locks the biasing means in a position lower than thepositioning projections of the guide shaft.
 27. The recording andreproducing device with a guide shaft attaching mechanisms according toclaim 12, characterized in that the locking section for controllingbiasing force of the biasing means to be fixed and locking the biasingmeans is formed in a hook shape and formed integrally with the supportsection of the guide shaft and locks the biasing means in a positionlower than the positioning projections of the guide shaft.
 28. Therecording and reproducing device with a guide shaft attaching mechanismsaccording to claim 13, characterized in that the locking section forcontrolling biasing force of the biasing means to be fixed and lockingthe biasing means is formed in a hook shape and formed integrally withthe support section of the guide shaft and locks the biasing means in aposition lower than the positioning projections of the guide shaft. 29.The recording and reproducing device with a guide shaft attachingmechanisms according to claim 14, characterized in that the lockingsection for controlling biasing force of the biasing means to be fixedand locking the biasing means is formed in a hook shape and formedintegrally with the support section of the guide shaft and locks thebiasing means in a position lower than the positioning projections ofthe guide shaft.
 30. The recording and reproducing device with a guideshaft attaching mechanisms according to claim 15, characterized in thatthe locking section for controlling biasing force of the biasing meansto be fixed and locking the biasing means is formed in a hook shape andformed integrally with the support section of the guide shaft and locksthe biasing means in a position lower than the positioning projectionsof the guide shaft.
 31. The recording and reproducing device with aguide shaft attaching mechanisms according to claim 16, characterized inthat the locking section for controlling biasing force of the biasingmeans to be fixed and locking the biasing means is formed in a hookshape and formed integrally with the support section of the guide shaftand locks the biasing means in a position lower than the positioningprojections of the guide shaft.
 32. The recording and reproducing devicewith a guide shaft attaching mechanisms according to claim 17,characterized in that the locking section for controlling biasing forceof the biasing means to be fixed and locking the biasing means is formedin a hook shape and formed integrally with the support section of theguide shaft and locks the biasing means in a position lower than thepositioning projections of the guide shaft.